81
TRANSMISSION
When moving at a slow speeds, at 1st-2nd gears of the gearbox
in acceleration-deceleration regime, audible knock in the form
of short clicks may occur in the driving system.
When moving at higher gears of the gearbox and the transfer
case at speed higher than 60 km/h in engine braking regime,
as well as during free running (neutral position of the gearbox),
the noise in the transmission system in the form of slight low-
frequency hum may occur; slight momentary rattling of the
transfer case shifting lever may appear.
During brisk acceleration of the vehicle, a slight knock may
occur during the selection of gaps in the spline coupling of the
transmission system.
During engine braking, a slight knock may occur during the
selection of gaps in the spline couplings of the transmission
system.
During free running and subsequent brisk acceleration of the
vehicle, a slight knock of synchronizer rings of the gearbox may
occur.
Clutch
During abrupt release of the clutch pedal, a single knock may
occur, because of the selection of the side gaps in tooth gear
couplings, spline couplings and in synchronizers of the gearbox.
The level of the fluid must be 15-20 mm lower than the upper
edge of the reservoir 2 (Fig. 9.20).
Incomplete clutch release and pedal "softness" indicate a
presence of air in the hydraulic system. Perform bleeding of the
system through the bypass valve of the clutch release cylinder,
similar to air bleeding of the hydraulic brake system.
Perform adjustment of the clutch release pedal by changing
the length of the master cylinder push rod 5 (See Fig. 9.20).
Full travel of the clutch release pedal with the diaphragm spring
must be 150 ±20 mm. Full travel of the clutch release pedal
with the spring and drawback lever must be 185 ±20 mm.
The free travel of the clutch release pedal with the diaphragm
spring (5-30 mm) is maintained by the clutch design and needs
no adjustment.
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